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<p>Text search support for prefix, keyword, and regular expression searches.
Each search engine type subclasses {@link prefuse.data.search.SearchTupleSet}, an implementation
of the {@link prefuse.data.tuple.TupleSet} interface. Classes derived from
SearchTupleSet (e.g., {@link prefuse.data.search.PrefixSearchTupleSet},
{@link prefuse.data.search.KeywordSearchTupleSet}, and 
{@link prefuse.data.search.RegexSearchTupleSet}) can be
instantiated and used directly or in conjunction with a
{@link prefuse.data.query.SearchQueryBinding}.</p>
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